Commit 378c9211 authored Jul 11, 2019 by Abhinav Kumar Committed by nshrivas Jul 25, 2019

qcacld-3.0: Set neighbor scan channel max time to 40 msec as default

Currently, Driver has below configuration:
1. The default value of Neighbor scan channel max time = 30 msec
2. Probe deferral time = 15 msec and
3. The gap between each Probe Request (Probe repeat time) = 20 msec

As per above roam scan params, after 15 msec of deferral time STA
sends the first probe irrespective of OCE or non-OCE environment.
So after the first probe, STA never sends the second probe because
15 msec + 20 msec = 35 msec which is beyond dwell time( 30 msec).
Because of lower dwell time, many a time STA is not getting enough
time to send the second probe request during a roam scan on the currently
associated channel. In case when STA sends only one probe req,
there is a lesser chance to receive Probe Response in a semi congested
or congested environment. This results in not finding a candidate
during a roaming scan.

STA should have enough time to send 2 Probe Requests under any condition
( clean or noisy) irrespective of the OCE/non-OCE environment.

Fix is to increase the default value of dwell time
"gNeighborScanChannelMaxTime" to 40 msec for STA.

Change-Id: I1bd52f5efe448ccb4ed4585e98aaf519379dd661
CRs-Fixed: 2467703

parent f77f42bc

core/hdd/inc/wlan_hdd_cfg.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -534,7 +534,7 @@ enum hdd_dot11_mode {
		* gNeighborScanChannelMaxTime - Set neighbor scan channel max time
		* @Min: 3
		* @Max: 300
		* @Default: 30
		* @Default: 40
		*
		* This ini is used to set the maximum time in secs spent on each
		* channel in LFR scan inside firmware.
		@@ -550,7 +550,7 @@ enum hdd_dot11_mode {
		#define CFG_NEIGHBOR_SCAN_MAX_CHAN_TIME_NAME "gNeighborScanChannelMaxTime"
		#define CFG_NEIGHBOR_SCAN_MAX_CHAN_TIME_MIN (3)
		#define CFG_NEIGHBOR_SCAN_MAX_CHAN_TIME_MAX (300)
		#define CFG_NEIGHBOR_SCAN_MAX_CHAN_TIME_DEFAULT (30)
		#define CFG_NEIGHBOR_SCAN_MAX_CHAN_TIME_DEFAULT (40)

		/*
		* <ini>